Internal lathe burner



Aug. 11, 1953 H R r 2,648,166

' INTERNAL LATHE BURNER 7 Filed March 6, 1950 3 Sheets-Sheet 1 ATTORNEY g 11, 3 F. A. FISHER mm. 2,648,166

INTERNAL LATHE BURNER Filed March 6, 1950 s Sheets-Sheet 2 CD Q 29 G CD 3 C) CD 5 1 O r I TEE 1, 1953 F. A. FISHER EI'AL INTERNAL LATHE BURNER Patented Aug. 11, 1953 UNITED STATES PATENT OFFICE 2,648,166 INTERNAL LATHE BURNER Floyd A. Fisher and Walter H. Kohl, Cedar Rapids, Iowa, assignors "to CollinsRadio Company, Cedar Rapids, Iowa, a corporation of Iowa Application March 6, 1950, Serial No. 147,918

2 Claims.

temperature such that it becomes plastic and forms a seal. The burners used for heating may burn natural gas and oxygen, and to assure uniform heating of the work either the burner or the work is rotated. This procedure works very well for glass up to a relatively thick cross-section, but as the thickness is increased the seal is not complete because sufiicient heat does not reach the inside portion of the work.

It is an object of this invention, therefore, to provide an internal burner which may be maintained within the confines of the members to be joined and thus apply heat to the internal surface.

Another object of this invention is to provide an internal glass burner which may be maintained within the members to be joined while the members are rotated about the stationary burner.

A further object of this invention is to provide an improved method of making a heavy glass seal.

A feature of this invention is found in the provision for an internal burner which is formed with a plurality of openings about its periphery, to which are furnished fuel gas and oxidizing gas, respectively, and which is maintained within the confines of members to be joined while they rotate.

Further objects, features, and advantages of this invention will become apparent from the following description and claims when read in view of the drawings; in which Figure 1 is a perspective view of a glass lathe with a pair of glass cylinders mounted between head and foot stocks, respectively, and with the internal gas burner of this invention held in its operative position;

Figure 2 is an enlarged isometric view of the burner of this invention;

Figure 3 is a sectional view taken on line 3--3 of Figure 2, and illustrates the relative spatial relationship among the various internal parts of the burner; and

Figure 4 is a sectional view of the burnersupporting stock illustrating how the burner support is assembled.

' and seal.

Figure 1 shows a glass lathe which comprises a base member [0, the head stock H andthe foot stock I 2. Suitable driving means, not shown, are controlled by the lever l3 and "are connected to drive the head and foot chucks of the lathe. The head stock II has mounted therein the chuck I4 and the foot stock l2 has mounted thereon the chuck iii. The chuck I4 has mounted thereon a glass cylinder ll and'the chuck it has mounted therein a second glass cylinder 18. If it is assumed'that the cylinders I1 and I8 are to be sealed together, their ends are placed in abutting engagement and heat applied externally to cause the material to fuse The conventional external burner which fits about the cylinder l1 and I8 is'not shown because it does not'form a part of this invention, although it might be used simultaneously.

As best shown in Figure 4, a support tube I9 is supported in the foot stock I2. The stock has a hollow movable cylinder 2! extending therethrough which is driven by the lathe motor, not shown. The means of driving are well known to those skilled in the art and is not shown for this reason. It is to be noted that the movable cylinder extends from either end of the foot stock. The end 25 of the cylinder has formed therein a groove 20 for receiving therein the holding pins of the chuck [6, shown in Figure 1.

Thus the chuck rotates with the cylinder 2|.

The inner walls 44 and 45 of the cylinder are tapered for receiving in mating engagement a pair of discs 46 and 41. The discs are rotatably mounted on the tube [9. The disc 46 is formed with an inclined surface 48 which may be wedged against the wall 45, whereas the disc 41 may be moved through the holding cylinder freely.

Longitudinal members 49 join the discs 46 and 41 together to maintain them in a predetermined spatial relationship.

A split 5| is formed with bevelled edges 52 and has a diameter larger than the cylinders central opening. The ring 5| is provided with clamping means, as for example bolts 53, for attaching it to the disc 41. Thus if the disc 41 is inserted through the cylinder 2| and the split ring 5| attached, the discs 46 and 41 will rotate with the cylinder 2| because of wedging action on the inclined surfaces 44 and 45.

A holding bracket 23 is of a general L shape and is connected to the foot stock by the bolts 24. A downwardly extending portion 26 is rigidly connected to the tube 19 for preventing longitudinal or rotational movement thereof.

Thus when the cylinder 2| is rotated the chuck l6 turns and moves the glass cylinder l8, whereas the tube l9 remains stationary. The discs 46 and 41 give longitudinal support and stability to the tube while the bracket 23 prevents longitudinal or rotational movement thereof.

The internal end of the tube l9 extends within the confines of the cylinders l1 and I8 and terminates in a burner designated generally as 21. Connected adjacent the opposite end of tube l9 are the supply lines 28 and 29. The line 28 may carry fuel gas, for example, and the line 29, oxygen. The tube |9 contains therein two separate passages which maintain the fuel gas and oxygen separate and supply them to the burner 21 in an unmixed condition. The gases are mixed in the burner, and when ignited burn with a very hot flame. The burner 21 is provided with radial openings from which the gas emerges. As the cylinders I1 and I8 are rotated, the flame from the burner 21 heats the internal surfaces to a plastic temperature. The rotation of the cylinders assures uniform heating and also prevents the glass from falling into the cylinder. Thus, centrifugal force aids in forming the seal.

Figure 2 illustrates the burner 21 in detail. It comprises a pair of plates 29 and 3| which are held together by the holding means 32. Between the plates 29 and 3| are formed a plurality of openings 33 from which the mixed gases emerge. Figure 3 is a sectional View taken on the line 33 of Figure 2 and illustrates the tube IS with its inner conductor 34 and its outer conductor 36 in their relative spatial relationship for supplying fuel gas and oxygen to the burner. The internal portion of the discs 29 and 3| are hollowed out and a partition 31 is received between them to divide the spaced formed into two chambers 38 and 39. The internal conductor 34 extends through the chamber 38, the partition 31, and emerges in the chamber 39. The outer conductor 36 opens into the chamber 38. Thus if oxygen is supplied to the outer conductor 36, the chamber 38 will contain oxygen, and if fuel gas is furnished to the inner conductor 34 it will be supplied to the chamber 39. An annular opening 4| is formed between the discs 29 and 3| adjacent the outer edges when the discs are assembled. Openings 42 connect the chamber 38 with the annular opening 4| to allow oxygen to arrive therein, and openings 43 extend from the chamber 39 to the annular opening 4| to furnish fuel gas thereto. At various points about the periphery of the burner are formed outlets 33 through which the mixed gas emerges. It is ignited as it leaves the burner and continues to burn as long as the fuel supply is left on.

In operation, the fuel gas is turned on and ignited and the burner is adjusted to the correct longitudinal position relative to the pieces to be joined. The work is rotated about the burner and heat is applied uniformly. An external burner may be used simultaneously to seal the outer edges of the pieces. When the glass is heated sufficiently it becomes plastic and makes the seal. The burner is then burned off and the work is allowed to cool before being removed from the lathe.

It is seen, therefore, that this invention provides means for maintaining a gas burner within the confines of pieces which are to be sealed and thus allows a superior and uniform seal.

Although this invention has been described with respect to particular embodiments thereof, it is not to be so limited as changes and modifications may be made therein which are within the full intended scope as defined by the appended claims.

We claim:

1. Apparatus for supporting an internal burner connected to a longitudinal member which extends through one of the stocks of a lathe, comprising a pair of disc-shaped collars rotatably connected to said longitudinal member, said discshaped collars rotatably supported by said stock, and a holding bracket connecting said stock to said longitudinal member.

2. An internal burner for a lathe, having a longitudinal double conduit passing through a rotating portion of a stock of said lathe, a support means, comprising a first disc rotatably mounted on said conduit having a bevelled facing, a second disc mounted on said conduit with a bevelled facing, means connecting said first and second discs and adapted to adjust them longitudinally along the conduit so that they may be locked to the rotatin portion of the stock.

FLOYD A. FISHER. WALTER H. KOHL.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 1,323,485 Mueller Dec. 2, 1919 1,373,565 Kunitz Apr. 5, 1921 1,741,662 Schoonenberg Dec. 31, 1929 FOREIGN PATENTS Number Country Date 961,324 France Nov. 21, 1949 

